sixstring
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your not mixing the 4.01 and 7.01 together right ? i only use the 7.01 to calibrate my ph pen and it seems to work fine on my cheap ass milwaulkie meter.but i would def use distilled or r/o water to make your slurry so you know its starting off clean,imo you will get a more accurate ph reading that way.your nutes being organic are going to show low on the ec/ppm test.but as others have made mention,get that ph up to 6.2 to 6.6 range and keep on rolling,plants will look even better in a few days if ya can just get the ph more into range for soil.so many people i know dont even check ph and have pretty good grows so dont get too anal on it,just do your best to correct as you feed.peaceyea im using FFOF 1 to 1 with Light Warrior and added perlite and EWC...i figured it may be too acidic and that may be why leaves are yellowing....thank you so much for being so helpful! I really apprciate it! p.s. my pH meter was only about 25$ but in the instructions it says to mix the 4.01 powder and 7.01 powder in distilled water..